如何在objective-c中确定哪个坐标更靠北

Question

我正在为我最新的iOS 5应用编写自定义注释视图，我正在寻找最新的SDK友好方式来比较2个CLLocationCoordinate2D坐标？

CLLocationCoordinate2D coordinate = (CLLocationCoordinate2D){33.0,-112.4};
CLLocationCoordinate2D coordinate = (CLLocationCoordinate2D){33.0,-112.3};

是否有内置的方法来确定这样的东西？

Answer 1

您不需要内置方法。您只需要比较latitude：

CLLocationCoordinate2D coordinate1 = (CLLocationCoordinate2D){33.0,-112.4};
CLLocationCoordinate2D coordinate2 = (CLLocationCoordinate2D){34.0,-112.3};

CLLocationCoordinate2D furthestNorth;
if (coordinate1.latitude > coordinate2.latitude) {
    furthestNorth = coordinate1;
} else {
    furthestNorth = coordinate2;
}
// OR
furthestNorth = (coordinate1.latitude > coordinate2.latitude) ? coordinate1 : coordinate2;